Disney released the May 2015 operating schedule today at the usual link: http://media.disneywebcontent.com/StaticFiles/ParkHours/WDWTravelAgent_may.pdf. Click refresh to load the newest version.
May looks to be straightforward this year. Expect average crowds over the first three weeks. Things pick up considerably going into May 22nd for Memorial Day Weekend and then stay high through the third week in August.
Star Wars Weekends looks to return on weekends beginning May 15th through mid-June.